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Is you RDS instance in a public subnet and Public access option set to Yes? If you select No, Amazon RDS will not assign a public IP address to the DB instance, and no EC2 instance or devices outside of the VPC will be able to connect.
Can you run
nslookup
to your RDS instance's domain name?
answered 2 years ago
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It's possible that the port is blocked by some part of the connection between the other countries and the AWS region. Have you looked at where the RST is being sent from?